ensuring local server is shut down when the main process exits

Author: rmisio

main.js

@@ -550,4 +550,9 @@ function openURL(uri) {
 app.on('open-url', function(event, uri) {
   openURL(uri);
   event.preventDefault();
+});
+
+// some cleanup when are app is exiting
+process.on('exit', () => {
+  kill_local_server();
 });